Well there are 2 ways you can do this, if you're on a DEX console you can simply replace the EBOOT.BIN in your games "USDIR" folder with an EBOOT that corresponds to your game region, or a debug which works with both regions. If you're on CEX you can skip the EBOOT method and download the CCAPI package file and install it onto your PS3. This allows you to connect to tools simply with your PS3 IP Address, download the package file off of this thread: You must login or register to view this content.
You can use the CCAPI method on a DEX console as well. And I think you're mistaken with the .elf, .elf can be opened in IDA to find offsets, there's more to a .elf but I'm not going to go in depth on it.